I'm struggling with an etiquette situation.
I went to school outside the USA, but have quite a few former schoolmates living in the USA right now. I tried to get as many of them as possible to come to my wedding, but had to make some cuts as my numbers are already out of control. Weddings are generally the only opportunity we get to see each other in large groups. I have other people coming for the wedding from outside the USA as well.
I invited someone "Andrew" and his wife, we are in fairly regular contact. I was unable to invite "Abe". I thought about it, but I couldn't swing it with the budget. We haven't spoken in a few years, but are on generally friendly terms. I had already heard from another friend that "Abe" had mentioned he really wanted to come and hoped he got an invitation.
Andrew called and said he would be able to come, but his wife couldn't make it. He specifically asked if I could invite Abe in her place instead?
The thing is, I now have room for Abe, and I'd love him to come, but I can't afford to host his wife and he needs to come alone. I don't think he would mind, since he's been asking.
How bad of an etiquette breach is this?